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by hkoenig
Thu Oct 01, 2015 9:24 am
Forum: Camera board
Topic: new 2x2 bin mode and RAW output
Replies: 13
Views: 3419

Re: new 2x2 bin mode and RAW output

FWIW, 2x2 binning on this device (and probably all Bayer-filter sensors) does not work the way you might at first think. It does NOT bin adjacent pixels together, actually it bins adjacent same-color pixels, to preserve color information in the subsampled output. The Bayer-pattern array has a repea...
by hkoenig
Sun Aug 30, 2015 3:39 pm
Forum: Camera board
Topic: Degradation or ageing of camara sensor?
Replies: 20
Views: 3041

Re: Degradation or ageing of camara sensor?

Hi, It sounds like you'd be better taking raspistillyuv as a basis to avoid any form of conversion - depends where any bandwidth limit is. Seems to make a lot of sense but first I have to learn how to get a raw rgb file into Squeak. I'll report back. Right now I have no means to view these files. B...
by hkoenig
Sat Aug 29, 2015 2:52 pm
Forum: Camera board
Topic: Degradation or ageing of camara sensor?
Replies: 20
Views: 3041

Re: Degradation or ageing of camara sensor?

Hi, It sounds like you'd be better taking raspistillyuv as a basis to avoid any form of conversion - depends where any bandwidth limit is. Seems to make a lot of sense but first I have to learn how to get a raw rgb file into Squeak. I'll report back. Right now I have no means to view these files. BT...
by hkoenig
Fri Aug 28, 2015 4:01 pm
Forum: Camera board
Topic: Degradation or ageing of camara sensor?
Replies: 20
Views: 3041

Re: Degradation or ageing of camara sensor?

Hi, Definitely, BMP output should not have such a bug. However it does seem that one image at 1296x972 resolution every five seconds is not particularly fast. How long does your Pi take to handle a JPEG of that size? On my RPi-2, where t.jpg is a 1296 x 972 image from the RPi camera, 'time convert t...
by hkoenig
Fri Aug 28, 2015 7:52 am
Forum: Camera board
Topic: Degradation or ageing of camara sensor?
Replies: 20
Views: 3041

Re: Degradation or ageing of camara sensor?

Hi, Please try without DRC - that's the one postprocessing algorithm that I wouldn't guarantee the quality of, and could quite possibly give the sort of effects you're seeing. The cause is not drc but saving in bmp format. The other options only influence the vertical position of the "line" but savi...
by hkoenig
Thu Aug 27, 2015 3:39 pm
Forum: Camera board
Topic: Degradation or ageing of camara sensor?
Replies: 20
Views: 3041

Re: Degradation or ageing of camara sensor?

Sorry forgot:
Latest kernel and software I assume:
Linux herpi4 4.1.6+ #810 PREEMPT Tue Aug 18 15:19:58 BST 2015 armv6l GNU/Linux
raspistill Camera App v1.3.8
by hkoenig
Thu Aug 27, 2015 3:33 pm
Forum: Camera board
Topic: Degradation or ageing of camara sensor?
Replies: 20
Views: 3041

Re: Degradation or ageing of camara sensor?

I have sometimes seen this on my cameras too. It seems to be possible, under some circumstances to get a frame buffer from the RPi camera which contains a combination of two separate exposures. I'm not sure what those circumstances are, possibly more likely with the first buffer returned after the ...
by hkoenig
Wed Aug 26, 2015 6:42 pm
Forum: Automation, sensing and robotics
Topic: Automatic pigeon scarer project
Replies: 8
Views: 2535

Re: Automatic pigeon scarer project

Hi, I recognize cats in the garden by their size in rectangles. http://i.imgur.com/GzGwkoR.jpg Software is in Squeak Smalltalk (the engine under the hood of Scratch) so I guess code is not useful. I take an image every 5 seconds (raspistill timelapse to ramdisk). I subtract two consecutive images an...
by hkoenig
Wed Aug 26, 2015 6:09 pm
Forum: Camera board
Topic: Degradation or ageing of camara sensor?
Replies: 20
Views: 3041

Re: Degradation or ageing of camara sensor?

Hi, everything close to the lens gets blurred and its a sharp perferct horizontal line at y=256 from the top as can be seen on the picture at http://imgur.com/DSBAhL2. If the person wore a red or yellow shirt the contrast would be bigger, in the blue channel the line is least visible. IMHO a CCD sen...
by hkoenig
Wed Aug 26, 2015 1:31 pm
Forum: Camera board
Topic: Degradation or ageing of camara sensor?
Replies: 20
Views: 3041

Degradation or ageing of camara sensor?

Hi, my PiNoir camera takes a photo every 5 seconds since April. That's around 17.000 a day or half a million photos per month. Since some time I notice a decreased sensitivity in the upper quarter of the picture. There's a sharp vertical line above which the picture is noticeably darker. In the atta...
by hkoenig
Mon Aug 24, 2015 6:55 pm
Forum: Raspbian
Topic: File Permissions for exported GPIO changed in Kernel 4.1.6
Replies: 8
Views: 3482

Re: File Permissions for exported GPIO changed in Kernel 4.1

Don't shoot me, I'm the messenger :-))

And what would be a better solution?
by hkoenig
Mon Aug 24, 2015 4:04 pm
Forum: Raspbian
Topic: File Permissions for exported GPIO changed in Kernel 4.1.6
Replies: 8
Views: 3482

[Solved] Re: File Permissions for exported GPIO...

Hi, after I raised an issue at http://github.com/raspberrypi/linux I got a reply from popcornmix<[email protected].com> which solved the problem. Thanks! Herbert Solution is to edit: /lib/udev/rules.d/60-python-pifacecommon.rules and /lib/udev/rules.d/60-python3-pifacecommon.rules (if they both e...
by hkoenig
Mon Aug 24, 2015 11:16 am
Forum: Raspbian
Topic: File Permissions for exported GPIO changed in Kernel 4.1.6
Replies: 8
Views: 3482

Re: File Permissions for exported GPIO changed in Kernel 4.1

Thanks to both, I'll raise an issue.

- Herbert
by hkoenig
Mon Aug 24, 2015 8:02 am
Forum: Raspbian
Topic: File Permissions for exported GPIO changed in Kernel 4.1.6
Replies: 8
Views: 3482

File Permissions for exported GPIO changed in Kernel 4.1.6

Hi, before my latest update, when exporting a GPIO pin like: ech 17 > /sys/class/gpio/export the file /sys/class/gpio/gpio17/direction would be read/writeable by owner root and group gpio. Same holds for the value file and the gpio17 folder. In the 4.1.6 kernel which I got with yesterdays update thi...

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